package cn.tedu;

import java.sql.*;

public class Demo03 {
    public static void main(String[] args) throws SQLException {
        Connection conn = DriverManager.getConnection(
                "jdbc:mysql://localhost:3306/empdb?characterEncoding=utf8&serverTimezone=Asia/Shanghai",
                "root","root");
        Statement s = conn.createStatement();
        //执行插入数据SQL
        //s.executeUpdate("insert into emp(name) values('Tom')");
        //执行修改数据的SQL
        //s.executeUpdate("update emp set name='Jerry' where name ='Tom'");
        //执行删除数据的SQL
        //s.executeUpdate("delete from emp where name='Jerry'");
        //执行查询
        ResultSet rs = s.executeQuery("select name,sal from emp");
        //遍历结果集对象
        while (rs.next()){
//            String name = rs.getString("name");
//            double sal = rs.getDouble("sal");
            //通过查询字段的位置获取数据
            String name = rs.getString(1);
            double sal = rs.getDouble(2);//1和2代表sql语句内 select 后面的字段的位置 select name,sal from emp
            System.out.println(name+":"+sal);
        }
        conn.close();
        System.out.println("执行完毕");
    }
}
